CN111451000B - Walnut shell micropowder multi-particle-size domain grading device and method based on multi-energy field driving - Google Patents

Walnut shell micropowder multi-particle-size domain grading device and method based on multi-energy field driving Download PDF

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CN111451000B
CN111451000B CN202010287094.0A CN202010287094A CN111451000B CN 111451000 B CN111451000 B CN 111451000B CN 202010287094 A CN202010287094 A CN 202010287094A CN 111451000 B CN111451000 B CN 111451000B
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powder
particle
walnut shell
windward
iii
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CN111451000A (en
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李长河
段振景
黄保腾
杨会民
李心平
刘向东
吐鲁洪.吐尔迪
陈毅飞
车稷
高连兴
赵华洋
刘明政
张彦彬
王晓铭
侯亚丽
石明村
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Qingdao University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/003—Pretreatment of the solids prior to electrostatic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators

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Abstract

The invention discloses a multi-energy-field-driven multi-particle-size-domain classification device and method for walnut shell micro powder, comprising the following steps: an air compressor for generating air flow and a powder conveying mechanism for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected to the classifying mechanism, and the classifying mechanism realizes multi-particle-size-domain classification of the powder through the Conda effect. The invention adopts a jet flow jet feeding process to realize the same-cavity parallel rapid classification of the multi-grain runoff of the walnut shell micro powder, and reduce the secondary agglomeration probability of the walnut shell micro powder.

Description

Walnut shell micropowder multi-particle-size domain grading device and method based on multi-energy field driving
Technical Field
The invention relates to the technical field of multi-particle-size domain classification of walnut shell micro powder, in particular to a multi-particle-size domain classification device and method of walnut shell micro powder based on multi-energy field driving.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The walnut shell is thick and hard in texture, and the average compression limit of the walnut shell particles with the particle size of 1.25-1.60mm is 230N; walnut shell particles with the particle size of 0.80-1.00mm have the average compression limit of 165N. The walnut shell powder with the grain size of 100 mu m can be added into an automobile tire to produce a new tire with extremely wear resistance, and the tire is harder than an ice layer, so that the pavement is not damaged, and dust pollution is not generated. As an abrasive with uniform granularity, good wear resistance, microporous surface and good adsorption effect, the walnut shell is subjected to degreasing, crushing, screening (about 0.08-1.11 mm) and the like, and can be applied to polishing and polishing of rare precious products such as pearl jewelry, buttons, electronic parts, stamping parts, high-grade furniture and the like.
Because the application fields of walnut shell powder with different particle sizes are different, the realization of the accurate classification of walnut shell micro powder is important to the improvement of the utilization rate of the walnut shell powder. The walnut shell powder shows different properties from the original materials after being subjected to superfine, the specific surface area is increased, and the walnut shell powder is easy to gather due to the actions of external impurities such as moisture and oil on the surface; the walnut shell micropowder is easy to be absorbed by collision in the crushing process or to be gathered on large particles by the action of static electricity and the like after crushing, and secondary particles with larger particle sizes are easy to be generated in the air. This makes classification of walnut shell micropowder more difficult than classification of ordinary products.
There are two main types of classifiers in the market at present, namely, classifiers and sieves. The sieving machine is a simple method for separating particles with different sizes through a sieve surface with a certain aperture, the particles with the particle diameter larger than the sieve aperture diameter are intercepted by the sieve surface, and the particles with the particle diameter smaller than the sieve aperture diameter become the sieve blanking through the sieve aperture. However, the screening performance is affected by the shape of particles and the screening time, and the walnut shell micropowder can cause blockage of screen holes in the actual screening process; generally, a sieving machine has high classification efficiency for particles of 100 μm or more, but the classification effect for ultrafine particles is not ideal. The walnut shell cell diameter is about 34 mu m, the particle size of the walnut shell micropowder with more than 500 meshes is about 10 mu m, and the classification effect of screening on the walnut shell micropowder is very little; in addition, during the sieving process of the walnut shell micropowder, the agglomeration phenomenon is inevitably aggravated by the action force among particles such as attractive force generated by friction charge, so that the sieving process is not suitable for the precise grading of the walnut shell micropowder. The classifier generates different motion tracks according to the action of centrifugal force, gravity and inertia force of particles with different particle sizes in fluid, and realizes the fine classification with smaller particle sizes. The gravity classification is to classify particles with different particle diameters by utilizing different sedimentation speeds in a gravity field, and the gravity classification is provided with a horizontal flow pattern and a vertical flow pattern according to different flow reversals of the flow field. The gravity grading device has simple structure, small resistance and large feeding amount, can realize primary multi-particle-size grading, but the grading particle size is limited to 200-2000 mu m, and the grading precision and efficiency are low. Because the inertia of different particle diameter particles receives in the inertia force field classification is different, forms different motion trails, realizes the separation of thick and thin granule, can once realize the classification of many particle diameter domain granule, and the classification precision is high, simple structure, easy maintenance, but the interference factor of flow field is more, difficult control. The coarse particles in the centrifugal classification device are thrown out along the radial direction of the rotating cage due to the fact that the centrifugal force is larger than the air drag force, fall down along the shell under the action of self gravity and are collected, and fine powder is sucked into the rotating cage due to the fact that the air drag force is larger than the centrifugal force and is carried out of the classifier along with air flow. The centrifugal classifier can only classify products with two particle diameters at a time, is suitable for finer classification, if multiple particle diameters are to be classified at a time, a mode of serial combination of multiple classifiers is needed, the serial classification process can realize multistage classification of particles, but the energy consumption is high, the movement route of the particles is long, the agglomeration probability is increased, the classification precision can be reduced due to the turbulent flow effect of the outer edge of a rotor, and particularly, the influence of turbulent flow is more obvious when the classification precision of the rotor is higher.
Realizing accurate classification of walnut shell micropowder in multiple particle size domains is an effective way for solving the technical bottleneck, and realizing efficient and high-quality classification of walnut shell micropowder mainly faces two challenges: on one hand, because the application fields of the particle sizes of different walnut micro-powder are different, the precise classification of multiple particle size domains is needed for realizing the efficient utilization of the walnut micro-powder, but the existing screening and classifying technology has the defects of high energy consumption, low efficiency precision, too wide particle size distribution range after classification and the like, and the multi-particle size domain classifying technology of the walnut shell micro-powder cannot be economically, efficiently and precisely realized; on the other hand, because walnut shell powder shows different properties after superfine grinding, the attraction between particles and the action of surface grease are easy to gather, multiple aggregation phenomenon is generated, uneven particle size distribution is caused, and the high-efficiency utilization of walnut shell micro powder in various fields is not facilitated.
The prior art discloses a method for improving powder particle classification precision and a particle classifier, wherein a hollow classification cavity is arranged in the particle classifier, so that fluid enters the classification cavity from the middle position in the height direction of the classification cavity along the tangential direction of the inner wall of the classifier cavity; by optimizing the hydrodynamic layout of the particle classifier, the position of the material entering the classifier is controlled according to the speed distribution characteristics of the particle classifying flow field, so that the high-precision classification of solid particles is realized.
The prior art discloses a double-cone spiral superfine particle classifier, which generates strong centrifugal force through high-speed rotation of a main shaft, so that coarse and fine particles are classified at the double-cone cavity and the thread sleeve in two stages, and finally the aim of superfine particle classification is fulfilled.
However, none of the above techniques take into account the problem of drying and micro-agglomeration of the powder.
Disclosure of Invention
In view of the above, the invention provides a multi-particle-size-domain classification device and a multi-energy-field-driven classification method for walnut shell micro powder, which can avoid multiple aggregation phenomenon during classification of walnut shell powder and realize accurate classification of the walnut shell micro powder in multi-particle-size-domain.
In some embodiments, the following technical scheme is adopted:
walnut shell miropowder multi-particle size domain grading plant based on multipotency field drive includes: an air compressor for generating air flow and a powder conveying mechanism for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected to the classifying mechanism, and the classifying mechanism realizes multi-particle-size-domain classification of the powder through the Conda effect.
Specifically, the grading mechanism includes: the classifying box body is provided with a coanda block on one side wall, and the top of the classifying box body is respectively provided with an electrode plate and a windward air pipe; the bottom of the classifying box body is provided with a plurality of classifying chambers with different particle grades; the charged powder can enter different classifying chambers according to the particle size under the combined action of the adsorption force of the Kangda block, the electric field force of the electrode plate and the windward force of the windward air pipe.
In other embodiments, the following technical solutions are adopted:
a multi-energy field driving-based multi-particle-size domain classification method for walnut shell micro powder comprises the following steps:
stirring walnut shell powder, pre-crushing, corona treating under the action of air flow with set pressure, and spraying into a grading mechanism;
the grading mechanism realizes multi-particle-size-domain grading of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention adopts a jet flow spraying feeding process to realize the same-cavity parallel rapid classification of the multi-grain runoff of the walnut shell micro powder, thereby reducing the secondary agglomeration probability of the walnut shell micro powder;
2) The invention is based on the coanda principle, and improves the classification efficiency and classification precision of the walnut shell ultrafine powder through the auxiliary adjustment of electric field force and windward force;
3) The dynamic adjustable precise classification of the walnut shell micropowder multi-grain runoff is realized by adjusting main technological parameters such as wind speed, windward air flow angle, electric field intensity, feeding speed and the like.
Drawings
Fig. 1 is a schematic structural diagram of a multi-particle-size-domain classification device for walnut shell micro powder based on multi-energy-field driving in an embodiment of the invention;
FIG. 2 is a schematic view of the structure of a pipe connection part in an embodiment of the present invention;
FIGS. 3 (a) - (b) are top and cross-sectional views, respectively, of a gas-solid mixer in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a hopper connected to a gas-solid mixer according to an embodiment of the present invention;
FIG. 5 is a schematic view of a powder valve according to an embodiment of the present invention;
FIG. 6 is a schematic view of a corotron structure in an embodiment of the present invention;
FIG. 7 is an isometric view of a corona bar in an embodiment of the invention;
FIG. 8 is an isometric view of a powder delivery mechanism in an embodiment of the invention;
FIG. 9 is a top view of an auger hopper in an embodiment of the invention;
FIG. 10 is a cross-sectional view of an auger coupled to an auger hopper in an embodiment of the present invention;
FIG. 11 is an isometric view of a screw conveyor blade in an embodiment of the invention;
FIG. 12 is an isometric view of a stirring rotor in an embodiment of the invention;
FIG. 13 is a front view of a hierarchy in an embodiment of the present invention;
FIG. 14 is a rear view of the staging mechanism in an embodiment of the invention;
FIG. 15 is an isometric view of a staging mechanism in an embodiment of the invention;
FIG. 16 is a top view of a windward pipe in an embodiment of the invention;
FIG. 17 is a partial cross-sectional view of a windward pipe in an embodiment of the invention;
FIG. 18 is an enlarged view of a portion of a windward airway in an embodiment of the invention;
FIGS. 19 (a) - (b) are an internal view and a cross-sectional view, respectively, of a grading mechanism in an embodiment of the present invention;
FIG. 20 is a schematic diagram of the coanda effect;
FIG. 21 is a schematic view of a square outlet tube configuration;
wherein, I, an air compressor, II, a pipeline part, III, a powder conveying mechanism and IV, a grading mechanism;
the gas-liquid separator comprises a first section of pipeline, a pressure regulating valve, a flow regulating valve, a second section of pipeline, a first screw, a sealing gasket, an air heater, a third section of pipeline, a hopper, a powder valve, a gas-solid mixer, a bolt, a fourth section of pipeline, a corona tube, a fifth section of pipeline, a nozzle and a nozzle, wherein the first section of pipeline, the pressure regulating valve, the flow regulating valve, the second section of pipeline, the first screw, the sealing gasket, the air heater, the third section of pipeline, the hopper, the powder valve, the gas-solid mixer, the bolt, the fourth section of pipeline, the corona tube, the corona rod, the fifth section of pipeline and the nozzle.
III-01, a speed reducer bracket, III-02, a second screw, III-03, a driving motor, III-04, a speed reducer, III-05, a connector, III-06, a stirring rotor shaft, III-07, a chain, III-08, a third screw, III-09, a screw bucket, III-10, a screw shell, III-11, a bearing cap nut, III-12, a bearing cap screw, III-13, a large chain wheel, III-14, a small chain wheel, III-15, a screw bracket, III-16, a stirring rotor, III-17, an external expansion bucket, III-18, a screw conveying blade, III-19, a bearing cap and III-20, a rotating shaft.
IV-01, classification box, IV-02, auxiliary air flow nozzle, IV-03, rotatable right-angle air pipe joint, IV-04, square outlet pipe, IV-05, fourth screw, IV-06, servo motor, IV-07, electrode plate, IV-08, fourth nut, IV-09, windward air pipe, IV-10, kangda block, IV-11, classification room.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
In one or more embodiments, a multi-energy field driven multi-particle size domain classification device for walnut shell micropowder is disclosed, comprising: an air compressor I for generating air flow and a powder conveying mechanism III for conveying powder; the air compressor I and the powder conveying mechanism III are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected to the classifying mechanism, and the classifying mechanism realizes multi-particle-size-domain classification of the powder through the Kangda effect.
Specifically, referring to fig. 1, the multi-energy-field-driven walnut shell micropowder multi-particle-diameter-domain classification device specifically comprises: the device comprises an air compressor I, a pipeline part II, a powder conveying mechanism III and a grading mechanism IV.
The main function of the air compressor part is to provide an air flow with a certain pressure. The pipeline part is mainly used for mixing air flow and powder and drying, and the powder particles are charged with the same charge so as to have tiny repulsive force to each other to prevent agglomeration. The air flow from the air compressor passes through a pressure regulating valve II-02, a flow regulating valve II-03, an air heater II-07, gas-solid mixed gas and a corona tube II-14 and finally enters a classification mechanism through a nozzle II-17.
Referring to fig. 2, the pipe section II structure includes: the first section of pipeline II-01 connected from the air compressor is sequentially connected with a pressure regulating valve II-02 and a flow regulating valve II-03 in series, and then is connected with an air heater II-07 through a flange of the second section of pipeline II-04 and a first screw II-05; a sealing gasket II-06 is arranged between the air heater II-07 and the second section of pipeline II-04, then the other end of the air heater II-07 is connected with the third section of pipeline II-08 through a flange and a screw, and a sealing gasket is arranged between the air heater II-07 and the third section of pipeline II-08; then the third section of pipeline II-08 is connected with the gas-solid mixer II-11 through a flange and screws; the other end of the gas-solid mixer II-11 is connected with a fourth section of pipeline II-13 through a flange and a bolt II-12, a sealing gasket is arranged between the gas-solid mixer II-11, the middle of the gas-solid mixer II-11 is connected with a powder valve II-10, and the powder valve II-10 is connected with a hopper II-09; the fourth section of pipeline II-13 is connected with the corona device through a flange by screws, a sealing gasket is arranged between the fourth section of pipeline II-13 and the fourth section of pipeline II-16, the other end of the corona device is connected with the fifth section of pipeline II-16 by screws, and the sealing gasket is arranged between the fourth section of pipeline II-13 and the fifth section of pipeline II-16; the other end of the fifth section of pipeline II-16 is connected with the nozzle II-17 through a quick connector.
The first section of pipeline II-01 is an elbow, the third section of pipeline II-08 and the fourth section of pipeline II-13 are flange pipes, and the fifth section of pipeline II-16 is an air pipe.
Referring to fig. 2-5, the middle pipe orifice of the gas-solid mixer II-11 is connected with a powder valve II-10, the powder valve II-10 is connected with a hopper II-09, the right end of the gas-solid mixer II-11 is connected with a corona pipe II-14 through a fourth section of pipeline II-13, a sealing gasket is arranged in the middle of the gas-solid mixer II-11, a fifth section of pipeline II-16 is used for connecting the corona pipe II-14 with a nozzle II-17, the corona pipe II-14 is connected with the fifth section of pipeline II-16 through a flange, and the fifth section of pipeline II-16 is connected with the nozzle II-17 through a quick connector.
Corona tube II-14 and corona rod II-15 with reference to FIGS. 6 and 7, four corona rods II-15 are mounted on one week of Corona tube II-14. The corona tube can charge the passing powder particles with the same charge through corona discharge, and the particles with the same charge repel each other to prevent agglomeration.
Referring to fig. 3 (a) - (b), one end of the pneumatic mixer is connected with an air inlet pipe, air flows through an accelerating pipeline, the air flows are ejected from a port of the accelerating pipeline, negative pressure is generated around the accelerating port, a feeding pipe is arranged in the middle, powder enters from the feeding pipe, and the powder enters into a speed reducing pipeline at the upper end under the driving of the air flow.
The principle of the gas-solid mixer is as follows: the high-speed air sprayed from the contraction section or the nozzle is used to make the pressure equal to or slightly lower than the atmospheric pressure at the throat pipe part, so that the powder particles fall into or are sucked into the feeder due to gravity, the speed of the high-speed air can accelerate the powder particles, and the high-speed air is converted into the pressure energy required by conveying in the diffusion pipe to carry out pneumatic conveying on the materials.
Figure BDA0002448929440000101
Wherein P is p Inlet pressure for the nozzle; p (P) t Is the nozzle throat pressure; u (u) t Is the nozzle exit velocity; r is a gas constant; t (T) P Is an inletA temperature; gamma is the gas constant.
Determining the throat diameter of the convergent nozzle according to inlet and outlet pressure and air flow:
Figure BDA0002448929440000102
wherein d t Is the nozzle throat diameter; m is the gas mass flow; ρ p Is the inlet gas density.
Figure BDA0002448929440000103
Wherein A is 3 Is the cross-sectional area of the mixing chamber; a is that t Is the nozzle throat area; pi (II) p The critical expansion ratio of the nozzle; p (P) c Back pressure for the delivery conduit; p (P) H Is the nozzle outlet pressure; lambda (lambda) P The isentropic velocity is converted for the nozzle,
Figure BDA0002448929440000104
as a coefficient of speed (f) the speed,
Figure BDA0002448929440000105
obtaining a nozzle distance equation according to a Sokolov theory;
L＝L 1 +L 2
wherein L is 1 Is the length of the free stream; l (L) 2 For the length of the inlet section of the mixing chamber.
The ratio of the length of the mixing chamber to the inner diameter can achieve a higher feed-gas ratio when the ratio is between 6 and 10, and the inner diameter of the mixing chamber is determined according to the optimal area ratio.
L k ＝(6～10)d z
Wherein L is k For the length of the mixing chamber; d, d z Is the mixing chamber diameter.
The angle of the diffusion chamber is typically 6-8 deg., the length is selected according to the outlet diameter, which is typically the diameter of the delivery conduit.
L D ＝(7～9.5)(d c -d z )
Wherein L is D Is the diffusion chamber length; d, d c Is the diffusion chamber outlet diameter.
Referring to fig. 8, the powder conveying mechanism III is composed of an auger conveying part and a stirring part, the auger conveying part includes an auger in which a rotation shaft III-20 connected with a screw conveying blade III-18 is provided; the stirring part comprises an auger hopper III-09 connected with an auger, the auger hopper III-09 is connected with an outer expansion hopper III-17, and a plurality of stirring rotors III-16 are arranged in the auger hopper III-09; the stirring rotors III-16 are connected to a stirring rotor shaft III-06; the rotating shaft III-20 is connected with the stirring rotor shaft III-06 through a transmission mechanism; the rotating shaft III-20 is driven to rotate by a driving device, so that the stirring rotor III-16 is driven to rotate. The powder enters the conveyor to be pre-crushed through the stirring part, then enters the auger to be stirred, and the conveying of the materials is completed loosely. And (3) feeding walnut shell powder into a feeding hopper of the gas-solid mixer through a powder conveying mechanism.
Specifically, the powder conveying mechanism includes: the speed reducer support III-01 is used for supporting the speed reducer III-04, and the auger support III-15 is used for supporting the auger; the speed reducer III-04 is connected with a speed reducer bracket III-01 through a second screw III-02; the auger comprises an auger shell III-10, an auger Long Waike III-10 is connected with an auger bracket III-15 through a third screw III-08, and the end part of the auger Long Waike III-10 is connected with a bearing cover III-19 through a bearing cover screw III-12 and a bearing cover nut III-11; the inside of the auger shell III-10 is provided with a rotating shaft III-20 connected with a spiral conveying blade III-18, the structure of the rotating shaft III-20 with the spiral conveying blade III-18 is shown in figure 11, and the rotating shaft III-20 extends out from one end of the auger shell III-10 and is connected with a speed reducer III-04 through a coupler III-05; the outlet at the other end of the auger shell III-10 corresponds to the hopper II-09, so that the powder output from the auger shell III-10 enters the hopper II-09.
Referring to fig. 9-10, a auger Long Waike III-10 is communicated with an auger hopper III-09, a stirring rotor III-16 is arranged in the auger hopper III-09, and the structure of the stirring rotor III-16 is shown in fig. 12.
The driving motor III-03 is arranged on the speed reducer bracket III-01, the driving motor III-03 is connected with the speed reducer III-04, the speed reducer III-04 is connected with a rotating shaft III-20 inside the auger through a connector III-05, a small chain wheel III-14 is arranged on the rotating shaft III-20, a large chain wheel III-13 is arranged on the stirring rotor shaft III-06, and the small chain wheel III-14 and the large chain wheel III-13 are connected through a chain III-07.
The driving motor III-03 drives the speed reducer III-04 to drive the rotating shaft III-20 to rotate, and the rotating shaft III-20 drives the stirring rotor III-16 to rotate through the transmission of the chain III-07, so that the purposes of stirring and conveying are achieved.
The conveying capacity of the auger is as follows:
Q＝47D 2 SNψ；
wherein Q is the conveying capacity (t/h); s is the pitch, D is the diameter (m) of the helical blade, N is the rotational speed (gamma/min) of the helical shaft, and ψ is the filling factor.
Referring to fig. 13 to 15, the classifying mechanism IV includes: the device comprises a grading box body IV-01, wherein a Kanga block IV-10 is arranged on one side wall of the grading box body IV-01, and an electrode plate IV-07 and a windward air pipe IV-09 are respectively arranged at the top of the grading box body IV-01; the bottom of the grading box body IV-01 is provided with a plurality of grading chambers IV-11 with different particle grades; the charged powder can enter different classifying chambers IV-11 according to the particle size under the combined action of the adsorption force of the Kangda block IV-10, the electric field force of the electrode plate IV-07 and the windward force of the windward air pipe IV-09.
Wherein the wall of the Kangda block IV-10 contacted with the powder particles is a curved wall. When the powder particles are ejected from the nozzle along with the air flow, if the particle size of the powder particles is smaller, the wall attaching effect of the powder particles along with the air flow is better, and the powder particles are easy to move along with the air flow along with the curved wall; if the particle size of the powder particles is larger, the powder particles are worse along with the wall attaching effect of the airflow, and fly out easily under the action of inertia and move away from the curved wall of the coanda block. At the near wall of the coanda block, the air flow pressure.
Referring to fig. 16-19 (a) - (b), one end of the windward air pipe IV-09 is connected with the servo motor IV-06 by a key so as to finely adjust the angle of the windward air pipe, and the other end of the windward air pipe IV-09 is provided with an air inlet which is connected with an external air inlet pipe by a rotary joint IV-03 so as to enable air flow to enter the windward air pipe IV-09. As shown in fig. 16 and 18, the windward air pipe is hollowed out, one side is an air flow outlet, one end is connected with a servo motor in a key way, and the other end is connected with a rotatable air inlet joint. The servo motor IV-06 and the grading box IV-01 are fixed in a matched mode through a fourth screw IV-05 and a fourth nut IV-08.
The powder enters the grading box IV-01, and different deflection tracks can be generated due to different inertia force and windward resistance of different particles carried in jet flow by utilizing the coanda effect of the coanda block IV-10, so that the walnut shell ultrafine powder is separated. The static electricity charged by different particles is different, and under the uniform and strong electric field generated by the electrode plate IV-07, the electric field force can have a downward electric field force on the particles to assist the separation of the particles. The windward air pipe generates windward force to assist walnut shell powder separation, and the servo motor IV-06 controls the windward air pipe to rotate so as to provide windward force of different angles.
The auxiliary nozzle IV-02 is arranged right above the gas-solid outlet of the Kangda block, and the auxiliary nozzle can help powder particles to adhere to the wall through the sprayed air flow so as to prevent the tiny particles from moving upwards.
Under the action of the coanda effect, the fine particles cling to the coanda block IV-10 under the combined action of the electric field force and the windward force, the middle particles are positioned at the middle part, and the large particles are far away from the coanda block IV-10. The fine powder particles are thus instantaneously divided into fine, medium and coarse three stages and then recovered separately in the downstream classification chamber IV-11.
As shown in FIG. 19 (b), the classifying chamber is formed by dividing triangular bodies at the bottom end of the classifying box body, and the classifying chamber is formed between the two triangular bodies.
Specifically, powder particles enter a grading box IV-01 under the drive of air flow, a coanda effect appears through a coanda block IV-10, and due to the inertia of the particles and the curved wall, the particles are separated according to the coanda effect due to different movement modes of particle size and mass, and due to particle charge, an even strong electric field generated by an I electrode plate IV-07 has a downward repulsive force on the charged particles, and the repulsive force can further assist the particles to enter different grading chambers IV-11, and windward force generated by a windward air pipe IV-09 assists the separation of fine particles on large particles so as to improve the separation efficiency. Particles with different particle diameters enter different classification chambers after being separated and then flow out and are packaged through a square outlet pipe IV-04, as shown in figure 21, the square outlet pipe IV-04 is hollow in the middle of a cuboid, and the top of the square outlet pipe IV-04 is arranged at the bottom end of a classification box body through a chute.
Referring to fig. 20, the principle of the coanda effect is described as follows:
near wall pressure P of Kangda block s The expression is:
Figure BDA0002448929440000141
the separation angle alpha of the jet flow along the wall surface of the coanda block is expressed as follows:
Figure BDA0002448929440000151
wherein: p is the nozzle outlet pressure, pa; p (P) ∞ The pressure is Pa of the far wall surface of the Kangda block; p (P) S Coanda block near wall pressure, pa; y is m Kang Dakuai radial distance from the position of maximum airflow speed on radial section of wall surface to the surface of wall-attached block is mm; b nozzle outlet width, mm; r is the curvature radius of the Kangda block, and mm; alpha is the separation angle of the air flow along the wall surface of the coanda block.
Coupling of forces:
F 1 ＝F e +F y cosO+mg
F 2 ＝F p -F y sinO
F 1 f is a downward force 2 F is a rightward force p Is the aerodynamic force to which the particles are subjected, F e For electric field force, F y For windward force, O is the included angle between the wind pipe and the vertical direction. The included angle can be adjusted by driving the electrodes to adjust the angle of the windward air flow.
Example two
In one or more embodiments, a multi-energy field driven multi-particle size domain classification method for walnut shell micropowder is disclosed, comprising:
stirring walnut shell powder, pre-crushing, corona treating under the action of air flow with set pressure, and spraying into a grading mechanism;
the grading mechanism realizes multi-particle-size-domain grading of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
Specifically, after the walnut shell powder is stirred through the powder conveying mechanism, the powder is conveyed into the gas-solid mixer through the auger, air flow with set pressure is generated through the air compressor, the walnut shell powder is conveyed through the air flow, and in the conveying process, corona treatment is carried out through the corona device, so that the adhesiveness of the powder is increased.
Under the drive of air flow, powder is sprayed into a grading mechanism, a coanda block of the grading mechanism generates a coanda effect, and walnut shell powder is graded according to the particle size; meanwhile, the grading efficiency is improved under the assistance of electric field force and windward force.
The size of the multi-grain runoff of the walnut shell micro powder can be dynamically adjusted by adjusting the wind speed, the windward air flow angle, the electric field intensity and the feeding speed parameters, so that the classification efficiency of the walnut shell micro powder is improved.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.

Claims (5)

1. Walnut shell miropowder multi-particle size domain grading plant based on multipotency field drive, its characterized in that includes: an air compressor for generating air flow and a powder conveying mechanism for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected to the classifying mechanism, and the classifying mechanism realizes multi-particle-size-domain classification of the powder through the Conda effect;
the grading mechanism includes: the classifying box body is provided with a coanda block on one side wall, and the top of the classifying box body is respectively provided with an electrode plate and a windward air pipe; the bottom of the classifying box body is provided with a plurality of classifying chambers with different particle grades; the charged powder can enter different classifying chambers according to the particle size under the combined action of the adsorption force of the Kangda block, the electric field force of the electrode plate and the windward force of the windward air pipe;
the wall of the Kang Dakuai, which is contacted with the powder particles, is a curved wall;
one end of the windward air pipe is connected with the servo motor, and the windward air pipe is driven by the servo motor to adjust the angle of windward air flow; the other end is connected with an external air pipe through a rotatable right-angle air pipe joint so that air flow enters a windward air pipe;
the output end of the gas-solid mixing mechanism is connected with a corona tube through a pipeline, the corona tube is connected with a nozzle through a pipeline, and the nozzle is connected with the grading mechanism;
the powder conveying mechanism comprises: a stirring part and an auger delivery part;
the auger conveying part comprises an auger, and a rotating shaft connected with spiral conveying blades is arranged in the auger;
the stirring part comprises an auger hopper connected with the auger, and a stirring rotor is arranged in the auger hopper;
the rotating shaft is connected with the stirring rotor through a transmission mechanism; the rotation shaft is driven to rotate through the driving device, and then the stirring rotor is driven to rotate.
2. The multi-energy-field-driven walnut shell micropowder multi-particle-size-domain classification device according to claim 1, wherein the air compressor and the gas-solid mixing mechanism are connected through a pipeline, and the pipeline is sequentially connected with a pressure regulating valve, a flow regulating valve and an air heater in series.
3. The multi-energy-field-driven walnut shell micropowder multi-particle-diameter-domain classification device as recited in claim 1, wherein the gas-solid mixing mechanism comprises: the powder conveying device comprises a gas-solid mixer, wherein a powder valve is arranged on the gas-solid mixer and connected with a hopper, and the hopper is used for receiving powder output by a powder conveying mechanism.
4. The multi-energy-field-driven multi-particle-size-domain classification method for the walnut shell micro powder is characterized by comprising the following steps of:
stirring walnut shell powder, pre-crushing, corona treating under the action of air flow with set pressure, and spraying into a grading mechanism;
the grading mechanism realizes multi-particle-size-domain grading of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
5. The multi-energy-field-drive-based multi-particle-size-domain classification method of the walnut shell micro powder as claimed in claim 4, wherein the size of the multi-particle runoff of the walnut shell micro powder can be dynamically adjusted by adjusting the wind speed, the windward air flow angle, the electric field strength and the feeding speed parameters so as to improve the classification efficiency of the walnut shell micro powder.
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